First steps
Tests for pending
json storage is getting better
task execution works
Move storage independent logic
Calculate pending migrations dynamically

Use all migrations - executed migration to calculate the pending
migrations.
Add (not yet finished) up and down method
Resolve the passed path

Resolve the passed path in order to get rid of relative paths.
Read storage file rather than requiring it
Test pending when migrations have been run
Refactor name generator
Add tests for up method
Consider the `to` options in Migrator#up
Finish down method
Add executed tests
Change value of storage in example
Remove migration model from storage
Add information about custom storages
Remove logic about migrations from storage
Merge pull request #1 from sequelize/feature/first-steps

Implement logic + JSON storage